There was nothing addressing iron levels. More concern over phosphates and elevated alk secondary to the make up of the rock, shell fragements and calcite.
I think some pieces are very attractive. If the purpose was a fish only tank I would give it a whirl, but for a tank with corals especially LPS and SPS I would probably pass.
I googled "coquina in marine tanks", not a lot of current information regarding it's use.

Right down the street is a limestone deposit for fossil hunters but there's phosphate in that rock too. Might be a FL thing.

Click to expand...

I looked into coquina rock when I lived in St Augustine to use in a saltwater tank and its not just phosphates and iron but its also the lack of the type of rock you want. Coquina is basically crushed shells but its not very porous so it isn't a good rock to try to turn into live rock.

i had coquina in a salt water tank 25 years or so ago and it was fine. It didnt look like that stuff ive seen on line though. this was just picked up off the beach where it had rounded edges from the surf and sand i suppose. Im not sure i like the look of the live rock i see in the store. when i was diving, i never really saw anything in the ocean that looked like it. therefore, i suppose it doesnt look like a natural environment to me. has anyone else seen places in the ocean that look like it?

Chiming in from Florida. I live a block from the ocean and took a few nice pieces from the beach and put them into my tank. My levels never really strayed off the norm. I did end up taking them out just because the color of it was boring in my tank. I like the idea of having pieces of my beach in the tank, but the look was plain. Also once I started adding more live rock it stuck out like a sore thumb.

Useful Searches

About 3Reef

Reef aquariums made easy with 3reef aquarium forums - one of the oldest and friendliest aquarium forums online. 3reef came online in 1996 as 'Three Steps To A Reef Aquarium.' This title was created as an attempt to overcome the common fears associated with keeping a reef aquarium, especially at that time. 3reef still retains its roots and remains a friendly forum for new people interested in aquariums and veteran hobbyist alike.